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Humans have questioned the existence of life on other planets for centuries \u2014 including celebrities such as Demi Lovato<\/strong><\/a>, Tom DeLonge<\/strong><\/a> and Gigi Hadid.\u00a0<\/strong><\/a><\/p>\n Lovato opened up about watching the 2020 documentary\u00a0Close Encounters of the Fifth Kind<\/em> on the \u201cWild Ride! with Steve-O\u201d podcast <\/a>in April of that year. The film explores the possibility of extraterrestrial civilizations and how they can make contact with humans.\u00a0<\/a><\/p>\n \u201cThe first encounter would be, like, seeing a UFO,\u201d Lovato explained. \u201cThe second would be some kind of proof being left behind. The third encounter would be, like, you have some sort of interaction with the alien. The fourth is, like, you\u2019re on board, you get abducted and then the fifth is human-initiated contact with aliens. I sound nuts right now.\u201d<\/p>\n DeLonge, for his part, is a longtime believer in aliens and UFOs. The Blink-182 musician <\/a>revealed in February 2015 that he\u2019s read 200 books about extraterrestrials.<\/a><\/p>\n